Add MCP Toplist rank badge

[chrstphe]

Hi! MCP Toplist tracks 81,686 MCP servers across the major
registries, and One MCP is currently ranked #400.

This PR adds a small live badge to your README showing that rank — it updates
automatically as the leaderboard changes:

Totally fine to close if you'd rather not — and if you'd like your server's
data corrected or removed from the leaderboard, just say so here or open an
issue at the site. Thanks for building One MCP!

Summary by CodeRabbit

• Documentation
  • Added an MCP Toplist badge near the top of the README with a link to the project’s listing.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 45eac4c9-ecc4-4532-8895-6cc0a4c1aeb5

📥 Commits

Reviewing files that changed from the base of the PR and between a4e8406 and 9bfa328.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

README.md now includes an MCP Toplist badge near the top, linking to the smithery/1mcp-app/agent MCP Toplist entry.

Changes

README badge

Layer / File(s)	Summary
Add MCP Toplist badge README.md	Adds an MCP Toplist badge and link near the top of the README.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: xizhibei

Poem

A bunny spots a badge bright,
Near the README’s morning light.
It hops to Toplist, quick and neat,
Where MCP listings proudly meet.
Carrots cheer the tidy feat!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: adding an MCP Toplist rank badge to the README.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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Warning

⚠️ This pull request has been flagged as potential spam (promotional) by CodeRabbit slop detection and should be reviewed carefully.